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Software & CAD

A Feedforward Power Amplifier with Loops to Reduce RX Band Noise and Intermodulation Distortion

Introduction to a new power amplifier developed to reduce amplified noise and intermodulation distortion signals using a feedforward technique
Technical Feature A Feedforward Power Amplifier with Loops to Reduce RX Band Noise and Intermodulation Distortion This article proposes a new power amplifier approach for the reduction of amplified noise signals in the receiver (RX) band as well as intermodulation distortion signals in the transmitter (TX) band using a...
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A Large Bandwidth T-shaped Microstrip-fed Ground Plane Slot Antenna

Use of the finite difference time domain method to analyze the impedance of the T-shaped microstrip feedline structure
Technical Feature A Large Bandwidth T-shaped Microstrip-fed Ground Plane Slot Antenna The characteristics of a T-shaped microstrip feeding a ground plane slot antenna have been analyzed using the finite difference time domain (FDTD) method. The impedance and bandwidth of the proposed antenna depend highly on the design parameters. The...
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Topics in Communication System Design: Carrier Triple Beats

Analysis of carrier triple beats that create third-order intermodulation interference when two or more carriers are present in one channel
Technical Feature Topics in Communication System Design: Carrier Triple Beats Howard Hausman Miteq Inc. Hauppauge, NY Intermodulation interference is typically calculated based on two signals present in the RF or IF bandwidth. When the bandwidth is less than an octave, even-order intermodulation products, such as second- and fourth-order intermodulation...
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Performing Transient Analysis on PLL Frequency Synthesizers

Use of system-level simulation tool with flexible behavorial modeling capability to simulate and enhance the performance of a wireless PLL circuit
Technical Feature Performing Transient Analysis on PLL Frequency Synthesizers A PLL can be considered a subsystem within a larger communications system, so it is appropriate to analyze this type of network with the help of a system-level simulator. The use of flexible behavioral models within the simulator allows only...
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A CMOS-based Front-end Downconverter for GPS Applications

Description of a CMOS-based front-end downconverter used to downconvert incoming satellite signals from 1.575 GHz to an intermediate frequency of 1.023 MHz
Product Feature A CMOS-based Front-end Downconverter for GPS Applications Valence Semiconductor Irvine, CA The industry is striving for single-chip Global Positioning System (GPS) designs given the limited real estate available within cell phones, personal digital assistants (PDA) and other consumer electronic devices. Since GPS designs are typically comprised of...
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A Hardware Multichannel Simulator for Wideband Wireless Systems

Introduction to a wideband multichannel simulator with eight fading channels, 70 MHz RF bandwidth and spatial channel modeling
Product Feature A Hardware Multichannel Simulator for Wideband Wireless Systems Elektrobit Kauniainen, Finland Hardware-based multipath fading simulators have traditionally been used to generate up to two simultaneous fading channels. Mobile network testing and future wireless applications like geolocation, smart antennas and multiple input multiple output (MIMO) systems, however, require...
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A Broadband, Four-bit, Ka-band MMIC Phase Shifter

Introduction to the design, fabrication and measurement of a broadband, four-bit, GaAs phase shifter at Ka-band frequencies
Technical Feature A Broadband, Four-bit, Ka-band MMIC Phase Shifter A compact, robust and broadband, four-bit, Ka-band phase shifter was designed and fabricated in a standard 0.25 m m PHEMT GaAs process. Design trade-offs, simulation versus measured results and architectures for the various bits to achieve broadband performance are discussed....
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Optimum Design for Linearity and Efficiency of a Microwave Doherty Amplifier Using a New Load Matching Technique

Presentation of a new design technique to match the complex load impedance of a Doherty amplifier for various power levels using offset transmission lines at the load modulation network
Technical Feature Optimum Design for Linearity and Efficiency of a Microwave Doherty Amplifier Using a New Load Matching Technique A Doherty amplifier with full load matching circuits of the carrier and peaking amplifiers at both low and high power levels is demonstrated for the first time. In the circuit...
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A High Efficiency, Low Cost Silicon Bipolar GSM Dual-band PA Module

Presentation of the design and measurement data for a PA module using silicon RF-IC bipolar chip technology on a simple ceramic substrate
Technical Feature A High Efficiency, Low Cost Silicon Bipolar GSM Dual-band PA Module T. Johansson, P. Lundin, J. Engvall and D. Uggla Ericsson Microelectronics AB Kista, Sweden U. Hagström Ericsson Microwave Systems AB Mölndal, Sweden As the wireless communication business continues to expand, there is great demand for reducing...
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Phase Invariant Attenuators

Use of phase invariant attenuator to change the amplitude in the processing of a microwave signal with minimal impact to the phase characteristic
Product Feature Phase Invariant Attenuators G.T. Microwave Inc. Randolph, NJ The function of a phase invariant attenuator is to change the amplitude in the processing of a microwave signal with minimal impact to the phase characteristic. The theory of operation is that when a signal reaches its maximum attenuation,...
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